Bicycle frame with built-in and removable battery

Abstract

Method for the producing of an extruded frame element with battery pack profile for use in a bicycle frame comprising a plurality of frame elements, where the frame elements are interconnected and constitute a structure with such great rigidity that the bicycle frame under ordinary loading does not change its geometrical shape, wherein the at least one frame element is extruded with variable material thicknesses in a given cross sectional profile, and a recess is made in the at least one extruded frame element, as well as a bicycle frame comprising such a frame element, wherein a stable bicycle frame with sufficient strength is achieved, and wherein the bicycle frame becomes as discreet as possible.

The invention claimed is: 
     
       1. Method for producing of an extruded bicycle frame element of a bicycle frame, where said extruded bicycle frame element comprises a separate battery pack profile, said bicycle frame comprising a plurality of frame elements, where the frame elements are interconnected and constitute a structure with such great rigidity that the bicycle frame under ordinary loading does not change its geometrical shape, wherein the at least one frame element is extruded with variable material thicknesses in a given cross section of the profile and wherein the frame element is not a multichamber profile and where said frame element comprises a top, a bottom, a first and a second side and where the bottom has greater material thickness than the first side and second side along the entire bottom, and wherein the first side and second side have a greater material thickness than the top, and providing a recess in the at least one extruded frame element adapted to receive a portion of the battery pack profile and extruding at least one battery pack profile with a cross sectional profile with a first part and a second part, and where the first part of the at least one battery pack together with the frame element's cross sectional profile in the recess is complementary to the frame element's cross sectional profile before the recess, wherein two side extensions extend downwardly from the bottom, thereby forming a channel on an outer side of the extended frame element, and the two side extensions have greater material thickness than the first side and second side. 
     
     
       2. Method for producing of an extruded frame element according to  claim 1 ,
 wherein the at least one battery pack profile is installed in the at least one extruded frame element's recess. 
 
     
     
       3. Bicycle frame, comprising a plurality of frame elements, including at least one frame element obtainable by the method according to  claim 1 . 
     
     
       4. Bicycle frame according to  claim 3 , wherein the at least one extruded frame element comprises an indentation at the bottom of the frame element's inner side, and wherein the second part of the at least one battery pack comprises a protrusion, the indentation and the protrusion being complementary. 
     
     
       5. Bicycle frame according to  claim 3 , wherein the channel comprises a closure arrangement, where the outer channel and the closure arrangement have mating closure devices. 
     
     
       6. Bicycle frame according to  claim 3 , wherein the at least one battery pack comprises a cross sectional profile with an outer shape whose first part is visible and whose second part is hidden when the battery pack is set into the frame element's recess.